JPH0225875Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an automatically folding handrail for a retractable stepped bleacher.

In recent years, in order to use the interior of gymnasiums for multiple purposes, it has become common to install retractable and movable tiered bleachers on a part of the floor near the wall. This viewing seat is formed by interconnecting a plurality of movable platforms with viewing chairs that increase in height so that they can move forward and backward and expand and contract. When these seats are in use, they are pulled out one after another starting with the lowest movable platform at the front, and the entire structure is extended into a dais-like structure, so that a large number of spectators can sit on the chairs on each movable platform. When not in use, the whole unit is reduced to a vertical shelf under the topmost movable bed by moving it backwards, starting with the first movable bed and returning it to the bottom of the rear movable bed in reverse order. However, it is configured so that it can be stored in a storage recess provided on the wall side of the building.

In this case, handrails that also serve as safety fences are provided at both end positions of the movable platform of each stage. When all the seats are stored, these handrails come into contact with the movable platform at the rear stage and get in the way, so conventionally, adjacent handrails were formed in advance so that they could be connected and disassembled, and when the seats were moved, In addition to joining and disassembling the handrails, the raising and lowering operations were performed manually. Therefore, it takes a lot of time and effort to connect, disassemble, and raise/lower the handrails before and after using the bleachers, which poses the problem of reducing the economic efficiency of multipurpose use in gymnasiums, etc. Ta.

This invention was made to solve the above problems, and its purpose is to connect the first link, which rotates by a predetermined angle by the driving force of the motor, to the second link via an intermediate pin. connect,
The second link is connected to the lower end of the handrail via a driven pin, and the lower end of the handrail is rotatably supported by a pin supported on the box, and the handrail is automatically moved using the pin as a fulcrum. To provide an automatically foldable handrail for a telescoping stepped grandstand, which is characterized in that it can be folded.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

First, to explain the configuration, as shown in part in Fig. 1, a multi-tiered movable platform 2 with viewing chairs 18 whose height increases in sequence during use is supported by supports 4 at both ends and mutually connected to each other. In the connected state, together with the base 1 for each stage equipped with rollers 3, the motor 17 placed on a part of the base 1 is used to sequentially pull out the base 1 from the lowest front stage side. When not in use, it is moved backwards from the front movable bed 2 to the rear movable bed 2 in order, and when not in use, it is moved backwards to the rear storage recess (not shown). 1) In the retractable staircase-like bleachers A that can be stored as a whole in a vertical shelf-like state, there are stair passageways with a slight width and height on both sides of each movable platform 2 that serves as the base. 19 are installed in a stacked manner,
A rectangular box 6 is fixed on the outer side of the stairway 19 in a manner perpendicular to the movable platform 2 of each step.

In the box 6 of the above embodiment, there is a handrail 5 as shown below.
Contains an automatic folding mechanism. That is, as shown in FIGS. 2 and 4, box 6
Output shafts 9a, 9 with the same diameter are equipped with a reducer approximately in the center of the frame and can rotate at the same speed in the same direction at the front and back positions of the frame.
A motor 9 in which b is symmetrically protruded horizontally and concentrically is housed in a manner parallel to the longitudinal direction. A gear 15 having the same diameter and meshing with a gear 16 to be described later is fitted on each output shaft 9a, 9b on each side. (Hereinafter, since both output shafts 9a and 9b have the same configuration, one output shaft 9a
Explain the side. ) An input shaft 10 having a first link 11 fitted to one end of the shaft portion is rotatably arranged directly below the output shaft 9a parallel to the output shaft 9a. On the input shaft 10 is a gear 1 fitted to the output shaft 9a.
A gear 16 of the same diameter that meshes with 5 is fitted.
A band-shaped second link 13 is swingably connected to the tip of the first link 11 via an intermediate pin 12. The tip of the second link 13 is loosely connected to a driven pin 14 that projects from the upper end of the lower end 7, which corresponds to the lower end of the handrail 5, which will be described below.

The handrail 5 is formed as follows. That is, as shown in FIGS. 1 to 4, the entire handrail 5 is formed into an inverted U-shape, and the lower end 7 of the rectangular flat plate with one of the four corners removed, It is fitted in such a manner that the rectangular plane portions are arranged in the front-rear direction. A pin 8 whose shaft end is supported on the internal vertical surface of the box 6 is loosely inserted in the horizontal direction from front to back in a portion of the rectangular flat portion near one side that is somewhat lower than the center portion. The handrail 5 is constructed so that it can be folded from an upright direction, where it is used as a handrail, to a horizontal direction, in contact with a stair passageway 19, when the bleachers A are stored, using a pin 8 as a fulcrum.

As shown in FIG. 4, when the first link 11 rotates in one direction to a limited angle around the input shaft 10 by the driving force of the motor 9 housed inside the box 6, the first link 11 The radius R of the trajectory C drawn by the intermediate pin 12, which is the tip of the handrail, is smaller than the radius S of the trajectory D drawn by the driven pin 14, which is the upper end of the lower end 7 of the handrail that falls in one direction with the pin 8 as the center. The position of the driven pin 14 when the handrail 5 is upright is set on an extension line where the first link 11 and the second link 13 are arranged approximately in a straight line, and the distance T from the input shaft 10 to the driven pin 14 is set on the trajectory C. If set to almost 3 times, the first link 1
1 rotates in one direction and pulls the driven pin 14 downward.
The distance V between the first link 11 and the second link 1 is
3 is bent in an L-shape, so by configuring it so that the distance is smaller than the distance T and approximately twice the radius R of the track C, the handrail 5 in an upright position when in use can be Stair passage 1 for storage
9 and the rear movable bed 2 in the horizontal direction, which corresponds to the space area B, is configured so that it can be folded easily, accurately, and automatically by a small-scale driving force.

When the lower handrail 5 of the spectator seat A equipped with the handrail 5 falls down toward the stair passageway 19 side of that step when it is stored, this falling operation presses a limit switch (not shown), and a signal of the fall is generated. The signal is transmitted to a control panel (not shown), thereby starting the retraction movement of the movable platform 2 of this stage. Furthermore, when the retraction of the lower movable platform 2 is completed, the handrail 5 installed on the upper movable platform 2 located immediately after it starts automatic folding operation in response to a command from the control panel. It is configured as follows.

Next, the action will be explained.

When storing the used bleachers A in the storage recess at the rear, first drive the motor 9 in the box 6 at the front stage, and the gears 15 fitted to each output shaft 9a, 9b of this motor 9 will be activated. As shown in FIG. 4, the first link 11 fitted on the input shaft 10 engages with the gear 16 on the input shaft 10 disposed directly below each side, as shown in FIG.
Rotates to a limited angle in one direction. In this case, the first link 11 is connected to the second link 13 via the intermediate pin 12.
are connected, so when the first link 11 is rotated to pull the second link 13, the second link 13 moves downwardly on the trajectory C defined by the intermediate pin 12 at the lower end. At this time, the upper end of the second link 13 is loosely connected to the upper end of the lower end 7 of the handrail via the driven pin 14, so that the lower end 7 of the handrail is also centered around the pin 8 that is loosely inserted into one end. and will be towed in the same direction.

By pulling the second link 13 against the lower end 7 of the handrail, the handrail 5 is folded in the direction of falling down about the pin 8 on the trajectory D drawn by the driven pin 14 at the lower end.
Due to the rotation of the input shaft 10, the distance T between the input shaft 10 and the driven pin 14 is shortened through an L-shaped deformable interlocking operation due to the rotation movement of the first link 11 and the downward movement of the second link 13. The handrail 5 is in an upright position when in use because it moves toward a distance V.
can be easily, accurately and automatically folded down in the horizontal direction corresponding to the space area B between the stairway passage 19 and the rear-side movable platform 2 with a small-scale driving force.

When the handrail 5 in the first stage is folded, the movable platform 2 in this stage is automatically moved backward by the driving force of the motor 17, and after this movement, the handrail of the next movable platform 2 on the upper stage side is folded. 5 is automatically folded by the same means as described above, and by repeating the above-mentioned operation in an interlocking manner, the movable floor table 2 is sequentially moved backward from the frontmost movable bed table 2 to below the movable bed table 2 adjacent to the rear thereof. As a result, bleachers A
The entire structure can be reduced to a vertical fence shape under the top movable bed 2 and stored in an external storage recess at the rear.

When using the bleachers A, when the motor 17 on the base 1 side is driven, the movable platform 2 at the frontmost stage first moves to the bottom of the group of movable platforms reduced to the shape of a vertical fence. When the handrail 5 of the movable platform 2 at the frontmost stage moves forward from the position by one stage, the same operation as described above causes the handrail 5 of the first stage of the movable platform 2 to return to its previous folding position due to the reverse driving force of the motor 9 and the reverse operation of each important part. It can be automatically made to stand upright. Immediately after this, the next movable platform 2 on the upper stage moves forward from the lowest position of the movable platform group in the same way as described above.By repeating this interlocking operation,
While pulling out the entire bleachers A one after another in the form of a dais,
The handrails 5 for each stage can be automatically erected each time to form a continuous safety fence.

As explained above, this idea
The handrail 5 for each step is formed as an independent body, and inside the box 6 disposed at the lower end of the handrail 5, there are a plurality of first links 11 and second links 13 operated by the drive of the motor 9. the operation board,
The handrail 5 is connected in an interlocking manner via the intermediate pin 12, and the tip of the second link 13 is connected to the upper end of the lower end 7 of the handrail by loose insertion of the pin 8 attached to the base end of the handrail 5. By assembling it so that it can be raised and lowered, when moving the bleachers A, there is no need for assembly, disassembly, or manual operation of raising and lowering it, and it can be operated easily, accurately, and automatically, which saves labor.
It has the effect of greatly increasing the economic efficiency of this kind of gymnasium.

[Brief explanation of the drawing]

Figure 1 is a partial side view showing a telescoping staircase-like bleachers equipped with automatic folding handrails at key points according to this invention; Figure 2 is a sectional view showing the automatic folding mechanism placed at the lower end of the handrail; FIG. 3 is a partial front view showing the raised/lowered position of the handrail, and FIG. 4 is a diagram showing the arrangement and operation of each essential part for raising/lowering the handrail. 2...Movable floor stand, 5...Handrail, 6...Box, 7
...lower end of handrail, 8...pin, 9...motor, 11
...first link, 12... intermediate pin, 13... second link, 14... driven pin, A... bleacher.

Claims (1)

[Scope of utility model registration request] The first link 11, which rotates by a predetermined angle by the driving force of the motor 9, is connected to the second link via the intermediate pin 12.
the second link 13 is connected to the lower end 7 of the handrail 5 via the driven pin 14;
The lower end part 7 is rotatably supported by a pin 8 supported on a box 6, and the handrail 5 can be automatically folded using the pin 8 as a fulcrum. Automatic folding handrail.